If you're getting the no xlate message, it usually means that you have not created a static or NAT rule for the relevant traffic, so regardless of what your ACL's say, the Pix won't pass the traffic.
Depending on whatever else you have on your Pix, and assuming that you want the GRE endpoint addresses left non-translated, you'll either be expanding the ACL on your NAT 0 rule, or you'll be creating a static entry such as:
Static (inside, outside) 10.1.1.1 10.1.1.1 netmask 255.255.255.255